What is REM sleep and why is it important?
REM sleep stands for rapid eye movement sleep. For most of the night, our eyes are still. However, every so often the eyeballs of a sleeping person will make rapid side-to-side movements under the lids. People woken up during these times report that they have been dreaming. During REM sleep the muscles of the body are very relaxed and movements are difficult. Some believe this semi-paralysis of the muscles stops us from walking around or otherwise acting out the scenes being played out in our dreams. Although adults spend only a fifth of the night in REM sleep, a newborn baby may spend half of its sleep in this stage. Some studies suggest that REM sleep is particularly useful for growth and repair of the brain itself, while the other type of deep, or slow-wave, sleep is useful for repair of the rest of the body.
